EP 2849337 A1 20150318 - Electric amplifier circuit for amplifying an output signal of a microphone
Title (en)
Electric amplifier circuit for amplifying an output signal of a microphone
Title (de)
Elektrische Verstärkerschaltung zur Verstärkung eines Ausgangssignals eines Mikrofons
Title (fr)
Circuit amplificateur électrique pour amplifier un signal de sortie d'un microphone
Publication
Application
Priority
EP 13184506 A 20130916
Abstract (en)
An electric amplifier circuit for amplifying an output signal of a microphone comprises a first amplifier component (110) having a first input terminal (E110a) for applying the output signal of the microphone and an output terminal (A110). A variable filter (1000, 2000) having a variable corner frequency is coupled in a feedback path (FP) between the output terminal (A110) of the first amplifier component (110) and a second input terminal (E110b) of the first amplifier component (110). The variable filter circuit (1000, 2000) comprises an electric component (120, 130, 140) being configured for setting the corner frequency of the variable filter circuit (1000, 2000).
IPC 8 full level
H03F 1/30 (2006.01); H03F 3/181 (2006.01); H03G 9/16 (2006.01)
CPC (source: EP)
H03F 1/30 (2013.01); H03F 3/181 (2013.01); H03G 9/16 (2013.01)
Citation (search report)
- [XI] EP 1298795 A2 20030402 - TOSHIBA KK [JP]
- [X] JP 2010118831 A 20100527 - SEIKO EPSON CORP
- [XA] US 4072906 A 19780207 - SCHRODER ERNST
- [A] US 4066976 A 19780103 - DICKOPP GERHARD, et al
- [A] DE 2312705 A1 19740926 - FELTEN & GUILLEAUME CARLSWERK
- [A] US 2010061576 A1 20100311 - JOHNSON WILLIAM A [US], et al
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DOCDB simple family (application)
EP 13184506 A 20130916